USB: Remove restrictions on signal numbers in devio.c

Just over a year ago (!) I had this brief exchange with Alan Stern:

>> It seems that the signal that can be used with USBDEVFS_DISCSIGNAL and
>> in usbdevfs_urb.signr is limited to the real-time signals SIGRTMIN to
>> SIGRTMAX. What's the rationale for this restriction? I believe that a
>> process can kill() itself with any signal number, can't it? I was
>> planning to use SIGIO for usbdevfs_urb.signr and SIGTERM (uncaught) for
>> USBDEVFS_DISCSIGNAL. I don't think I'll have a problem with using
>> SIGRTMIN+n instead, but I'm curious to know if there's some subtle
>> problem with the non-real-time signals that I should be aware of.
>
> I don't know of any reason for this restriction.

Since no-one else could think of a reason either, I offer the following
patch which allows any signal to be used with USBDEVFS_DISCSIGNAL and
usbdevfs_urb.signr.

Signed-off-by: Phil Endecott <usbpatch@chezphil.org>
Cc: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index aa79280..c85e293 100644 (file)
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -981,9 +981,6 @@ static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
                return -EINVAL;
        if (!uurb->buffer)
                return -EINVAL;
-       if (uurb->signr != 0 && (uurb->signr < SIGRTMIN ||
-                                uurb->signr > SIGRTMAX))
-               return -EINVAL;
        if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
            (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
                ifnum = findintfep(ps->dev, uurb->endpoint);
@@ -1401,8 +1398,6 @@ static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
 
        if (copy_from_user(&ds, arg, sizeof(ds)))
                return -EFAULT;
-       if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
-               return -EINVAL;
        ps->discsignr = ds.signr;
        ps->disccontext = ds.context;
        return 0;